const zkService = '6E400001-B5A3-F393-E0A9-E50E24DCCA9E';
const zkRead = '6E400003-B5A3-F393-E0A9-E50E24DCCA9E';
const zkWrite = '6E400002-B5A3-F393-E0A9-E50E24DCCA9E';

const int kTimeOut = 30;
